We stayed for a month and had a great experience.
The major pluses are (1) the host was very fast to respond and accommodating; (2) the flat is very large; (3) the building staff are very friendly and some in the management office speak English; (4) cleaning every few days is included in the price; (5) the local neighborhood has lots of great street food etc. (special shout out to the cart halfway down Suan Phlu Soi 8 doing old-school coconut ice cream with sticky rice, corn and peanuts).
The only downsides I can think of are (1) the building is old and some of the common areas are a bit tired; (2) it's a bit far to the BTS or MRT.